4000mAh Emergency Mobile Power Rechargeable Battery Pack with 10-in-1 Cell Phone Charger Adapter

Pros: When my mobile main battery weaks, this is great emergency power source fot it. I never ever lost my important call, or my GPS never turns off, when I need it. Build quality looks fine.

Cons: - bundled USB cabel doesn't work,
- main charging USB connector of charger loosen on first use, when i glued it back, it works fine,
- only chinese information attached on back side of product

Other: I recommend this product to anyone who needs extra power for mobile phone or GPS device, when no other power source is near.

Pros: * Can charge up to 2-3 devices at the same time. * Has a built in light.

Cons: * Often it stops charging and the charger dies and has power but have to insert charger to revive it. * Does not have as much power as DX claims. * The charging port is very fragile

Other: Pay a few more dollars and get something that you will be happy with. Would not suggest this product, since u can get something better for a few extra dollars.

Pros: this is a very usefull battery to have, it's can be not have all the 4000mAh that he said, but works great - my died mp4 battery is almost died, but with this one pluged i can use it like it is pluged in eletric plug

Cons: i see 2 main problems:
1-the instructions is all in hinese, so take a while to me to understand how charge the battery ( a little usb pop up and you have to buy a usb extensor to use it in a plug or usb port)
2-the on/off is very fragile - broke in less than a month.
I still can use it with a thin pencil to turn on, but must be more resisten to not get this problem

Other: I recommend, but if you get some problem with this is pure luck

Pros: Is very cheaper, easy of use and come with one small light (one high bright led). Comes with one adapter from usb male to any phone charger connector, iPhone, Samsung, Nokia, any you want and if your connector is not included, you can plug your USB to phone cable to charge because the box has a usb female connector. My Samsung Galaxy R with a 1800 mAh battery the charger takes no more than 1 hour and a half to charge from 30 % to 100 %. To power it on you only need to slide the button to the first position and a blue light must power on, when you plug the phone the light changes to red. If you slide the button to the next position the service light must power on and for charge it only connect it to a USB port or to any USB charger.

Cons: It comes with the manual in chinese and all the instructions in the box are in chinese, but is really easy to use it and you must not have any problem to use it.

Other: If you need a portable USB power source this is very recommended.